Clock



FIG. 1 is a front elevational view of a clock showing my new design, therear being flat, plain and unornamented;

FIG. 2 is a left side elevational view thereof, the right side beingsubstantially similar thereto;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof.

The ornamental design for a clock, substantially shown and described.